Denslow is famous for his illustrations for The Wonderful Wizard of Oz. You can read more about his life and career at Wikipedia.
The book is available at Project Gutenberg. You can get a free Kindle ebook from Amazon too! There's also a presentation of the Project Gutenberg pages via Internet Archive.
Here is an animated gif of some of the illustrations:
Humpty-Dumpty sat on a wall...
Mistress Mary, quite contrary...Bye, baby bunting...
Little Jack Horner...
Old King Cole...
Baa, baa, black sheep...
Pat-a-cake, pat-a-cake, baker's man...
Great A, little a...
To market, to market, to buy a fat pig...
I love little Pussy, her coat is so warm...
Higglepy, Piggleby, My black hen...
Hickety; dickety, dock...
Hush-a-bye, baby, on on the tree top...
There was an old woman who lived in a shoe...
Poor old Robinson Crusoe...
Rain, rain, go away...
The rose is red...
Little Boy Blue, come blow up your horn...
There was an old woman tossed up in a basket...
Ride a cockhorse to Banbury-cross...
The Queen of Hearts, she made some tarts...
Little Bo-peep has lost her sheep...
The north wind doth blow...
There was an old woman, and what do you think...
Simple Simon met a pieman...
Little Miss Muffet...
Little Tom Tucker...
Mary had a little lamb...
A diller, a dollar...
I had a little hobby-horse...
Peter, Peter, pumpkin-eater...
Jack and Jill went up the hill...
The man in the moon...
Hey! diddle, diddle...
There was a fat man of Bombay...
Hark, hark! The dogs do bark...
Jack be nimble...
Three wise men of Gotham...
Deedle, deedle, dumpling, my son John...
Cock a doodle doo...
Polly, put the kettle on...
